//! Testing PWM output
//!
//! ```
//! 
//! #![deny(unsafe_code)]
//! #![deny(warnings)]
//! #![no_std]
//! 
//! extern crate cortex_m;
//! extern crate panic_abort;
//! extern crate stm32f103xx_hal as hal;
//! 
//! use cortex_m::asm;
//! use hal::prelude::*;
//! use hal::stm32f103xx;
//! 
//! fn main() {
//!     let p = stm32f103xx::Peripherals::take().unwrap();
//! 
//!     let mut flash = p.FLASH.constrain();
//!     let mut rcc = p.RCC.constrain();
//! 
//!     let clocks = rcc.cfgr.freeze(&mut flash.acr);
//! 
//!     let mut afio = p.AFIO.constrain(&mut rcc.apb2);
//! 
//!     // let mut gpioa = p.GPIOA.split(&mut rcc.apb2);
//!     let mut gpiob = p.GPIOB.split(&mut rcc.apb2);
//! 
//!     // TIM2
//!     // let c1 = gpioa.pa0.into_alternate_push_pull(&mut gpioa.crl);
//!     // let c2 = gpioa.pa1.into_alternate_push_pull(&mut gpioa.crl);
//!     // let c3 = gpioa.pa2.into_alternate_push_pull(&mut gpioa.crl);
//!     // let c4 = gpioa.pa3.into_alternate_push_pull(&mut gpioa.crl);
//! 
//!     // TIM3
//!     // let c1 = gpioa.pa6.into_alternate_push_pull(&mut gpioa.crl);
//!     // let c2 = gpioa.pa7.into_alternate_push_pull(&mut gpioa.crl);
//!     // let c3 = gpiob.pb0.into_alternate_push_pull(&mut gpiob.crl);
//!     // let c4 = gpiob.pb1.into_alternate_push_pull(&mut gpiob.crl);
//! 
//!     // TIM4
//!     let c1 = gpiob.pb6.into_alternate_push_pull(&mut gpiob.crl);
//!     let c2 = gpiob.pb7.into_alternate_push_pull(&mut gpiob.crl);
//!     let c3 = gpiob.pb8.into_alternate_push_pull(&mut gpiob.crh);
//!     let c4 = gpiob.pb9.into_alternate_push_pull(&mut gpiob.crh);
//! 
//!     let mut pwm = p.TIM4
//!         .pwm(
//!             (c1, c2, c3, c4),
//!             &mut afio.mapr,
//!             1.khz(),
//!             clocks,
//!             &mut rcc.apb1,
//!         )
//!         .3;
//! 
//!     let max = pwm.get_max_duty();
//! 
//!     pwm.enable();
//! 
//!     // full
//!     pwm.set_duty(max);
//! 
//!     asm::bkpt();
//! 
//!     // dim
//!     pwm.set_duty(max / 4);
//! 
//!     asm::bkpt();
//! 
//!     // zero
//!     pwm.set_duty(0);
//! 
//!     asm::bkpt();
//! }
//! ```
// Auto-generated. Do not modify.
